Preet Bharara, the former US Attorney in New York who was fired by President Trump, said Sunday that he thinks Trump could be the target of an obstruction investigation.

“There is absolutely evidence to begin a case,” Bharara said on ABC’s “This Week.”

Meanwhile, Susan Collins, the Republican senator from Maine, said a subpoena of Trump might be appropriate if he has recordings of his converations with James Comey but does not provide them. Collins was speaking on CNN’s “State of the Union.”

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“He should give a straight yes or no to the question of whether the tapes exist,” Collins said. “I don’t understand why the president doesn’t clear this matter up once and for all.”

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Collins added that, “I would be fine with a subpoena, but that would likely come from the speical counsel.” She was referring to Robert Mueller, who has been named special counsel in the investigation of the Trump campaign and administration and Russia.

Collins said about James Comey’s testimony on Thursday that “I found him to be candid, to be thorough, and he testified under oath.”

Collins said Trump’s private meeting with Comey “should not have occurred. There’s just no doubt about that.”

Bharara said Trump’s inexperience as president isn’t an excuse for private meetings with Comey. Comey said he felt pressure from Trump to drop an investigation into Michael Flynn and that Trump wanted Comey’s loyalty. Trump disputes those characterizations of the meetings.